US2681498A - Ejector mechanism for bar feed machines - Google Patents

Description

Jlmezz, 1954 B. c. HARNEY EJECTOR MECHANISM FOR BAR FEED MACHINES 2 Sheets-Sheet l Filed June 5, 1951 June 22, 1954 B. c. HARNEY EJECTOR MECHANISM FOR BAR FEED MACHINES 2 Sheets-Sheet 2 Filed June 5, 1951 iron/vnf Patented June 22, 1954 EJECTOR MECHANTSM Foa BAR. FEED" MACHINES Bernard C. Harney, Syracuse, N. Y., assigner to Lipe-Rollway Corporation, Syracuse, N. Y.,-a corporation of New York Application June, 1951-, Serial No. 230,007

3 Claims. (C1. 2li-93) l 2 j Thisinvention relates to ejector mechanism for andA ejector embodying the feature ofI this instock.. bar feeds for automatic metal working vention, the feed plunger-being shown as shifted machines, and has for its object the construction to thelimit of its feeding movement within the of a` feed plunger for the stock bar having an spindle andthe jaws of the collet. fejectorto eject the remnant of a stock bar a pre- Figure 2 is a longitudinal, sectional view of the :determined distance out of the feed plunger into guide for the stock bar and the feed plunger.

the jaws of the collet, or such a distance that Figure 3 is an elevation, partly in section, of a 'the jaws of the collet will always engage the slightly modified form of the feed plunger and :remnanta sufficient minimum axial length, deejector.

pendent upon the diameter of the stock bar io l designates the rotating spindle of an au- 'zbeing operated on, so that a remnant not long tomatc metalworking machine, and 2 the collet enough to ,reachthe'stop of the automatic screw provided with jaws shaving an opening and machine willfall out when pushed by a new closing movement. The spindle is rotated by the :stock barbeing` fed by the feed plunger. usual well known mechanism,` and also the collet It isnecessary that a remnant be gripped by 15 is operated to open and close its jaws by the the collet jaws an axial extent at least equal to usual mechanism. The collet rotates with the 4thediameter ofthe stock bar. Thus, it is necspindle. The collet is opened and closed bythe essary that the remnant `of say one-eighth of an usual mechanismincluding a lever 4. The mechinch stockbar be gripped by the jaws of `the collet anism for rotating the spindle and the collet, at least an axial `distance of one-eighth of an 2c and for opening and closing the collet, form no inch, and that a quarter of an inch stock bar be part of this invention.V

gripped at least an axial distance of one-duar- As best seen in Figure 2, the stock bar slides ter of an inch, etc. The ends of the stock bars in a guide, as a tube 5, and is fed by a feed or are usually seated in a conical socket at the adpusher plunger axially into the spindle and the vance end of the feed plunger andhence, a stock collet against a work stop on the turret of the barof smaller diameter extends farther into the metal working machine, this stop being designated socket thanstock bars-of larger diameters. E in Figure l.

The purpose of this invention is a mechanism The feed plunger, as here shown, is in three forlimiting the ymovement of the injector into sections 7, 3 and S, these sections being axially or k.through thesocket of thefeedplunger so that a( spaced so'that the section 8 is an intermediate a-reinnant will be gripped by the collet jaws at section between the section 'l and the headset:- least an axial" distance` equal to the diameter tion 9; The sections? and 8 are connected by of. the stock bar and will not be gripped at a a neck or rod lil. The section l does not pass less distance` if the end-of `the stock `bar when out of the end of the feed `tube 5 into the spindle fed., engages thestop of` the automatic` metal :a of the metal working machine. The head secworking machine; Hence,` the projecting end is tion Si, however, does pass into the spindle of never infirmly` held 4in the jaws of the collet. the metal working machine and partway into the Thus, by .thisinventiom nopiece of the remnant collet. of the stock bar will be fed out far enough to The feed plunger section 1 does not rotate with engage the stop and be iniirmly held bythe collet. .er the stock bar when the stock bar is gripped by The invention `consists inthe novel features the colletjaws and hence,the neck I0 is conandin the combinations and constructions herenected to the intermediate section 8 by an antiinafter set forth and claimed. friction thrust bearing il.

In describing `this invention, reference is had i2 is a compression spring between the into the accompanying drawings in whiohlke Char 4r, termediate section s and the head section 9 to eters designate COI'IESDODdIle rparts in all the permit the feed plunger sections 'I and B to con- VieWS. tinue to shift axially relatively to the head sec- TiS uplltn iS a @Onlml'olrbpelt 0f tion `9 when the head section 9 is stopped in its my. copending a-DDICelOlV Ser. No. 37,646, filed axial shifting movement by coacting stop shoul- July. 3 l9i8.,lnow` Patent. No. 2,595,522granted derson the colletV andthe ejector, as will be May .6," 1952. presently described.

Figure 1 isafragmentary elevation, partly in I3 designates an ejector, this being shown as section,vof Va barnfeed mechanism and theoona rod arranged coaxial with the feed plunger tiguous. portionoffthe rotating spindle and collet sections tand e and secured or anchored at its cfa metalworking machine andthe feed plunger rear end atill vtothe advance endof the interthe collet and the head section to limit movement of the head section into the collet, the end of the ejector rod being movable into the conical socket when the movement of the head section is stopped by said shoulders, said ejector rod being formed with an enlargement normally positioned against the end wall of the bore in said rear portion of the head section, and a spacer element removably mounted in said bore and being interposed between the enlargement on the ejector rod and the end wall of the bore in said forward portion to limit forward axial movement of the ejector rod relative to the head section into said socket to a predetermined distance when said spring is compressed and to thereby position the end remnant of the bar for proper gripping by the collet.

3. A mechanism for feeding step by step bar stock to a rotatable spindle and the collet of metal working machines, said mechanism comprising a push plunger consisting of a head section and a second section axially spaced rearwardly therefrom, said head section having forward and rear portions detachably secured together and being formed with alined apertures, and having an enlarged enclosed bore intermediate said apertures, said forward portion being also formed with a conical socket for receiving the end of a stock bar, an ejector rod extending from the second section axially through the aperture in said rear portion for slid ing movement therein, and a compression spring between the sections, there being a coacting shoulder on the collet and the forward portion of the head section to limit movement of the head section into the collet, said ejector rod having a forward end portion mounted for rotation in the head section and extending through the aperture in said forward portion of the head section, said rod having an enlargement normally engaging the end wall of said bore in the rear portion, and a spacer element detachably mounted in said bore and being positioned between the enlargement of said rod and the end wall of the bore in said forward portion, said spacer being of such dimensions to limit forward movement of said rod relative to the head section and to thereby position the end remnant of the bar for proper gripping by the collet.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,808,452 Cousins June 2, 1931 2,339,712 Mariotte Jan. 18, 1944 2,572,741 McCoy Oct. 23, 1951` 2,601,494 Baule June 24, 1952

Images